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Expected Positive Exposure. The Expected Positive Exposure (EPE) is the weighted average over time of the expected exposure, where the weights are the proportion that an individual expected exposure represents of the entire exposure horizon time interval [1]. The EPE can be calculated as.
A positive result (antigen detected) is indicative of H pylori presence. A negative result (antigen not detected) indicates absence of H pylori or an antigenic level below the assay limit of detection. The test has a sensitivity and specificity of 96% for detecting H pylori infection.